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.IX Title "MRTG 1"

.TH MRTG 1 "2018-07-13" "2.17.7" "mrtg"

.\" For nroff, turn off justification.  Always turn off hyphenation; it makes

.\" way too many mistakes in technical documents.

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.nh

.SH "NAME"

mrtg \- What is MRTG ?

.SH "DESCRIPTION"

.IX Header "DESCRIPTION"

The Multi Router Traffic Grapher (\s-1MRTG\s0) is a tool to monitor

the traffic load on network links.  \s-1MRTG\s0 generates \s-1HTML\s0 pages

containing \s-1PNG\s0 images which provide a \s-1LIVE\s0 visual representation of

this traffic.

.PP

Go to http://oss.oetiker.ch/mrtg for all the details about mrtg.

.SH "HIGHLIGHTS"

.IX Header "HIGHLIGHTS"

.IP "Portable" 4

.IX Item "Portable"

\&\s-1MRTG\s0 works on most \s-1UNIX\s0 platforms and Windows \s-1NT.\s0

.IP "Perl" 4

.IX Item "Perl"

\&\s-1MRTG\s0 is written in Perl and comes with full source.

.IP "Portable \s-1SNMP\s0" 4

.IX Item "Portable SNMP"

\&\s-1MRTG\s0 Uses a highly portable \s-1SNMP\s0 implementation written entirely in

Perl (thanks to Simon Leinen). There is no need to install any

external \s-1SNMP\s0 package.

.IP "SNMPv2c support" 4

.IX Item "SNMPv2c support"

\&\s-1MRTG\s0 can read the new SNMPv2c 64bit counters. No more counter wrapping.

.IP "Reliable Interface Identification" 4

.IX Item "Reliable Interface Identification"

Router interfaces can be identified by \s-1IP\s0 address, description and

ethernet address in addition to the normal interface number.

.IP "Constant size Logfiles" 4

.IX Item "Constant size Logfiles"

\&\s-1MRTG\s0's logfiles do \s-1NOT\s0 grow thanks to the use of a unique data

consolidation algorithm.

.IP "Automatic Configuration" 4

.IX Item "Automatic Configuration"

\&\s-1MRTG\s0 comes with a set of configuration tools which make configuration and

setup very simple.

.IP "Performance" 4

.IX Item "Performance"

Time critical routines are written in C (thanks to the initiative

of Dave Rand my Co-Author).

.IP "\s-1GIF\s0 free Graphics" 4

.IX Item "GIF free Graphics"

Graphics are generated directly in \s-1PNG\s0 format using the

\&\s-1GD\s0 library by Thomas Boutell.

.IP "Customizability" 4

.IX Item "Customizability"

The look of the webpages produced by \s-1MRTG\s0 is highly configurable.

.IP "RRDtool" 4

.IX Item "RRDtool"

\&\s-1MRTG\s0 has built-in hooks for using RRDtool. If you are strapped for

performance this may help.

.SH "DETAILS"

.IX Header "DETAILS"

\&\s-1MRTG\s0 consists of a Perl script which uses \s-1SNMP\s0 to read the traffic

counters of your routers and a fast C program which logs the traffic

data and creates beautiful graphs representing the traffic on the

monitored network connection. These graphs are embedded into webpages

which can be viewed from any modern Web-browser.

.PP

In addition to a detailed daily view, \s-1MRTG\s0 also creates visual

representations of the traffic seen during the last seven days, the

last five weeks and the last twelve months. This is possible because

\&\s-1MRTG\s0 keeps a log of all the data it has pulled from the router. This

log is automatically consolidated so that it does not grow over time,

but still contains all the relevant data for all the traffic seen over

the last two years.  This is all performed in an efficient manner.

Therefore you can monitor 200 or more network links from any halfway

decent \s-1UNIX\s0 box.

.PP

\&\s-1MRTG\s0 is not limited to monitoring traffic, though.  It is possible to

monitor any \s-1SNMP\s0 variable you choose. You can even use an

external program to gather the data which should be monitored via

\&\s-1MRTG.\s0 People are using \s-1MRTG,\s0 to monitor things such as System Load,

Login Sessions, Modem availability and more. \s-1MRTG\s0 even allows you to

accumulate two or more data sources into a single graph.

.SH "HISTORY"

.IX Header "HISTORY"

In 1994 I was working at a site where we had one

64kbit line to the outside world. Obviously, everybody was interested

in knowing how the link was performing. So I wrote a quick hack which

created a constantly updated graph on the web that showed the traffic

load on our Internet link. This eventually evolved into a rather

configurable Perl script called \s-1MRTG\-1.0\s0 which I released in spring

1995. After a few updates, I left my job at \s-1DMU\s0 to start work at the

Swiss Federal Institute of Technology. Due to lack of time I had to

put \s-1MRTG\s0 aside. One day in January of 1996, I received email from

Dave Rand asking if I had any ideas why \s-1MRTG\s0 was so slow. Actually, I

did. \s-1MRTG\s0's programming was not very efficient and it was written

entirely in Perl. After a week or so, Dave wrote back to me and said

he had tried what I had suggested for improving \s-1MRTG\s0's speed. Since

the changes did not help much, he had decided to rewrite the

time-critical sections of \s-1MRTG\s0 in C. The code was attached to his

email. His tool increased the speed of \s-1MRTG\s0 by a factor of 40! This

got me out of my '\s-1MRTG\s0 ignorance' and I started to spend my spare time

developing of \s-1MRTG\-2.\s0

.PP

Soon after \s-1MRTG\-2\s0 development had begun I started to give beta

copies to interested parties. In return I got many feature patches, a

lot of user feedback and bug fixes. The product you are getting now

wouldn't be in this state if it hadn't been for the great contributions

and support I received from of many people. I would like

to take this opportunity to thank them all. (See the files \s-1CHANGES\s0 for a

long list of folk people who helped to make \s-1MRTG\s0 what it is today.)

.SH "Command-line"

.IX Header "Command-line"

Mrtg is also the name of the script you have to run to poll data and

generate the graphs. Most configuration is set through the configuration

file; some command-line options exist all the same.

.IP "\fB\-\-user\fR \fIusername\fR  and \fB\-\-group\fR \fIgroupname\fR" 4

.IX Item "--user username and --group groupname"

Run as the given user and/or group. (Unix Only)

.IP "\fB\-\-lock\-file\fR \fIfilename\fR" 4

.IX Item "--lock-file filename"

Use an alternate lock-file (the default is to use the configuration-file

appended with \f(CW\*(C`_l\*(C'\fR).

.IP "\fB\-\-confcache\-file\fR \fIfilename\fR" 4

.IX Item "--confcache-file filename"

Use an alternate confcache-file (the default is to use the configuration-file appended with \f(CW\*(C`.ok\*(C'\fR)

.IP "\fB\-\-logging\fR \fIfilename\fR|\fBeventlog\fR" 4

.IX Item "--logging filename|eventlog"

If this is set to writable filename, all output from mrtg (warnings, debug messages, errors)

will go to \fIfilename\fR. If you are running on Win32 you can specify \fBeventlog\fR instead of a filename

which will send all error to the windows event log.

.Sp

\&\fB\s-1NOTE:\s0\fRNote, there is no Message \s-1DLL\s0 for mrtg. This has the side effect

that the windows event logger will display a nice message with every entry

in the event log, complaing about the fact that mrtg has no message dll. If

any of the Windows folks want to contribute one, they are welcome.

.IP "\fB\-\-daemon\fR" 4

.IX Item "--daemon"

Put \s-1MRTG\s0 into the background, running as a daemon. This works the same way as

the config file option, but the switch is required for proper \s-1FHS\s0 operation  

(because /var/run is writable only by root)

.IP "\fB\-\-fhs\fR" 4

.IX Item "--fhs"

Configure all mrtg paths to conform to the \s-1FHS\s0 specification

<http://www.pathname.com/fhs/>. The following default values are assumed:

.Sp

.Vb 4

\& confcachefile \- /var/cache/mrtg/mrtg.ok

\& pid\-file      \- /var/run/mrtg.pid

\& lock\-file     \- /var/cache/mrtg/mrtg.lck

\& log\-file      \- /var/log/mrtg.log

.Ve

.IP "\fB\-\-check\fR" 4

.IX Item "--check"

Only check the cfg file for errors. Do not do anything.

.IP "\fB\-\-pid\-file=s\fR" 4

.IX Item "--pid-file=s"

Define the name and path of the pid file for mrtg running as a daemon

.IP "\fB\-\-log\-only\fR" 4

.IX Item "--log-only"

Only update the logfile, do not produce graphics or html pages

.IP "\fB\-\-debug=s\fR" 4

.IX Item "--debug=s"

Enable debug options. The argument of the debug option is a comma separated list of debug values:

.Sp

.Vb 8

\& cfg  \- watch the config file reading

\& dir  \- directory mangeling

\& base \- basic program flow 

\& tarp \- target parser

\& snpo \- snmp polling 

\& fork \- forking view 

\& time \- some timing info

\& log  \- logging of data via rateup or rrdtool

.Ve

.Sp

Example:

.Sp

.Vb 1

\& \-\-debug="cfg,snpo"

.Ve

.SH "READ ON"

.IX Header "READ ON"

Learn more about \s-1MRTG\s0 by going to the mrtg home page on:

http://oss.oetiker.ch/mrtg

.SH "AUTHOR"

.IX Header "AUTHOR"

Tobias Oetiker <tobi@oetiker.ch> and many contributors